The DSC1121DL2-040.0000T is a 40 MHz MEMS-based XO (Standard) with CMOS output, rated across -40°C to 105°C and qualified to AEC-Q100 — the under-hood temperature band where a quartz oscillator's frequency drift or startup failure would cause a missed CAN frame or a sensor read timeout. Supply voltage spans 2.25V to 3.6V, covering both 2.5V and 3.3V logic rails from a single rail — no separate LDO needed for the oscillator supply.
MEMS resonator vs quartz — shock tolerance and startup
MEMS oscillators have inherently higher shock and vibration tolerance — relevant for engine-bay and transmission-mounted ECUs where quartz crystals can fracture or exhibit microphonic frequency modulation. Startup time for MEMS oscillators is typically under 5 ms, compared to 10-20 ms for a quartz crystal with load capacitors — the Enable/Disable pin on this part lets the system hold the output in tri-state until the supply rail is stable, then release it without waiting for a crystal to resonate.
Active production — AEC-Q100 traceability
The 6-SMD no-lead package (2.50mm x 2.00mm, 0.90mm seated height) is a standard footprint shared across the DSC1121 family — the same PCB land pattern serves any frequency in the series, simplifying BOM consolidation.